one who uses a british dialect (though not pertaining to britain in any way) with a rabid obssession to harry potter, daniel radcliffe, cedric diggory, and all other hp fiascos. one who has walked around in public bearing a lightning bolt on their forhead, wire-rimmed glasses, or a stick while shouting encantations.

People that are well into the Harry Potter books and movies, constantly stringing off lines of it in front of others. They tend to be generally unpopular.